usb: dwc3: meson-g12a: fix shared reset control use

The reset is a shared reset line, but reset_control_reset is still used
and reset_control_deassert is not guaranteed to have been called before
the first reset_control_assert call. When suspending the following
warning may be seen:

WARNING: CPU: 1 PID: 5530 at drivers/reset/core.c:355 reset_control_assert+0x184/0x19c
Hardware name: Hardkernel ODROID-N2 (DT)
[..]
pc : reset_control_assert+0x184/0x19c
lr : dwc3_meson_g12a_suspend+0x68/0x7c
[..]
Call trace:
 reset_control_assert+0x184/0x19c
 dwc3_meson_g12a_suspend+0x68/0x7c
 platform_pm_suspend+0x28/0x54
 __device_suspend+0x590/0xabc
 dpm_suspend+0x104/0x404
 dpm_suspend_start+0x84/0x1bc
 suspend_devices_and_enter+0xc4/0x4fc
 pm_suspend+0x198/0x2d4

Fixes: 6d9fa35a347a87 ("usb: dwc3: meson-g12a: get the reset as shared")
Signed-off-by: Dan Robertson <dan@dlrobertson.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
index 1f7f4d8..88b75b5 100644 (file)
--- a/drivers/usb/dwc3/dwc3-meson-g12a.c
+++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
@@ -737,13 +737,13 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
                goto err_disable_clks;
        }
 
-       ret = reset_control_reset(priv->reset);
+       ret = reset_control_deassert(priv->reset);
        if (ret)
-               goto err_disable_clks;
+               goto err_assert_reset;
 
        ret = dwc3_meson_g12a_get_phys(priv);
        if (ret)
-               goto err_disable_clks;
+               goto err_assert_reset;
 
        ret = priv->drvdata->setup_regmaps(priv, base);
        if (ret)
@@ -752,7 +752,7 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
        if (priv->vbus) {
                ret = regulator_enable(priv->vbus);
                if (ret)
-                       goto err_disable_clks;
+                       goto err_assert_reset;
        }
 
        /* Get dr_mode */
@@ -765,13 +765,13 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
 
        ret = priv->drvdata->usb_init(priv);
        if (ret)
-               goto err_disable_clks;
+               goto err_assert_reset;
 
        /* Init PHYs */
        for (i = 0 ; i < PHY_COUNT ; ++i) {
                ret = phy_init(priv->phys[i]);
                if (ret)
-                       goto err_disable_clks;
+                       goto err_assert_reset;
        }
 
        /* Set PHY Power */
@@ -809,6 +809,9 @@ err_phys_exit:
        for (i = 0 ; i < PHY_COUNT ; ++i)
                phy_exit(priv->phys[i]);
 
+err_assert_reset:
+       reset_control_assert(priv->reset);
+
 err_disable_clks:
        clk_bulk_disable_unprepare(priv->drvdata->num_clks,
                                   priv->drvdata->clks);